Rank the Following Compounds in Order of Decreasing Acidity, Putting

Multiple Choice

Rank the following compounds in order of decreasing acidity, putting the most acidic first. $$\begin{array} { c c c c } \mathrm { CH } _ { 3 } \mathrm { OCH } _ { 3 } & \mathrm { CH } _ { 3 } \mathrm { CHO } & \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OH } & \mathrm { CH } _ { 3 } \mathrm { COOH } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}$$

A) IV > II > III > I
B) IV > III > II > I
C) III > IV > II > I
D) III > IV > I > II